Dielectric Measurement for Barium Titanate Nanoparticles Using Far Infrared Reflection Method

Takuya Hoshina; Hirofumi Kakemoto; Takaaki Tsurumi; Satoshi Wada

doi:10.4028/www.scientific.net/KEM.350.47

Paper Titles

Crystallinity of Barium Titanate Nanoparticles Synthesized by Sol-Gel Method
p.31

Sintering and Dielectric Properties of BaTiO₃ Nano-Particle Prepared by Aerosol Plasma Pyrolysis Process
p.35

Preparation of Barium Titanate Nanoparticles Using Nano-Sized Oxalate and Deposition of their Nanoparticle Dense Films
p.39

Fabrication and Characterization of Alkoxy-Derived (Na, K)NbO₃ Series Powder
p.43

Dielectric Measurement for Barium Titanate Nanoparticles Using Far Infrared Reflection Method
p.47

The State and Optical Properties of Crystalline BaTiO₃ Nanoparticles Dispersed in Various Suspension Media
p.51

Synthesis of Complex Perovskite Oxides via Nanosheets Process
p.55

Control of Mesoscopic Particle Structure in Barium Titanate Nanoparticles and their Dielectric Properties
p.59

Ferroelectric Distortion in Bi₄Ti₃O₁₂ Studied by Neutron Powder Diffraction
p.65

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Dielectric Measurement for Barium Titanate Nanoparticles Using Far Infrared Reflection Method

Abstract:

Barium titanate (BaTiO3) nanoparticles with various particle sizes from 20 to 430 nm were prepared using a 2-step thermal decomposition method. Powder dielectric measurement clarified that dielectric constant of BaTiO3 particles with 140 nm exhibited a maximum around 5,000. To explain this high dielectric constant, THz-region dielectric properties of BaTiO3 nanoparticles, especially Slater transverse optic (TO) mode frequency, were estimated using the far infrared (FIR) reflection method. As the result, it was found that the Slater TO mode of BaTiO3 particles with 140 nm exhibited a minimum. Therefore, the high dielectric constant around 5,000 at 140 nm can be originated from the softening of the Slater TO mode.